.... For the present experimental conditions tested, the peak value of streamwise turbulence intensity seems to be not related to the amount of DR directly and to be affected by the low Reynolds number effect strongly. Keywords: Turbulent Boundary Layer, Drag Reduc- tion, Surfactant Solution, LDV Measurement...

... 26 03 2009 In this study, confined swirling flows of an aqueous surfactant solution due to a rotating disc in a cylindrical casing were investigated using a sectional flow visualization technique and a two-component laser Doppler velocimetry (LDV) system. The concentrations of aqueous...

... to the friction factor, f T , was proposed. It was obtained that f T was linearly proportional to the product of frequency and strength of turbulent events. Drag reduction Vortex structure Turbulent event Surfactant solution PIV Proceedings of HT-FED 2004: ABSTRACT of dim ve in ins str of dra...

... 05 02 2009 In this study, an effect of an additive on a bend loss was examined. Measurements of pressure distributions along pipes connected to pipe bends were performed using a drag-reducing surfactant solution. The additive used is being commercialized as a drag reducer and it has...